Which Origin character are you looking forward to playing?
Absolutely none.
I'll only play my custom character (and ideally a Fully Custom Character, not a Semi-Custom Character like Gorion's Ward, if that is at all possible).
The option of playing an Origin Character is an idea completely antithetic to the feeling of a DnD campaign that Larian purports to want to convey.
It's also a huge resource investment. I can somewhat understand that Larian may want to cater to as many audiences as possible at once (which is not without risk), and some players may prefer a pre-made character. But I think 2-4 Origin Characters would have been enough. Offering 5, or 8 or 12 Origin Characters is a Very Bad Idea, in my view.